Telephonic relay.



,296. PATENTED SEPT. 20, 1904.

I. KITSEE. TELEPHONIG RELAY. N0 MODEL. APPLICATION FILED JAN. 8, 1903.

WITNESSES: I INVENTOR:

WP I 2 w UNITED STATES Patented September 20, 1904.

PATENT OFFICE.

ASSIGNMENTS, TO KEYSTONE STATE TELEPHONE AND TELEGRAPH COMPANY, OFPHILADELPHIA, PENNSYLVANIA, A CORPORATION OE PENNSYLVANIA.

TELEPHONlC RELAY.

SPECIFICATION forming part of Letters Patent No. 770,296, datedSeptember 20, 1904.

Application filed January 8, 1908. Serial No. 138,243. (No model.)

To a, whom) it may concern:

Be it known that I, IsIDoR KITsEE, of Philadelphia, in the State ofPennsylvania, have invented certain new and useful Improvements inTelephonic Relays, whereof the following is a specification, referencebeing had to the accompanying drawing.

My improvements relate particularly to relays of the class comprising apolarized armature; and it is the object of my invention to provide adevice which is not only mechanically simple and compact, but capable ofthe most eificient utilization of the feeble electrical impulses whichare to be relayed or intensified.

It is characteristic of my invention, as hereinafter described, that thepolarized armature is always in electrical connection with the cores ofthe electromagnets in the transmitting-circuit, such connectionbeingestablished through microphonic material which is interposedbetween the polarized armature and the opposed oppositely-polarized endsof said cores and said material being in the magnetic lines of forcebetween the opposing poles of said magnets.

My invention comprehends the various novel features of construction andarrangement hereinafter more definitely specified.

In the accompanying drawing I have shown a convenient form of myinvention embodied in a single-wire system. However, it is to beunderstood that I do not desire to limit myself to such embodiment as myimproved relay may of course be utilized in connection with a two-wiresystem.

Referring to the drawing, L is the transmitting-line, which is groundedat G, and L is the receiving-line, which is grounded at G. Themagnet-coils A A are included in said transmitting-circuit L and arerespectively provided with cores B B, independently supported in theframes O O and adapted to be respectively adjusted toward and away fromeach other by means of the screws D D.

The polarized armature E is conveniently formed of a flexible magnetizedsteel strip,

whose upper extremity extends between the opposed cores B B and iscontinuously maintained in electrical connection therewith by conductorsb 6, whose conductivity is variable. Said conductors 7) 5 maybe attachedeither to said armature or to said cores and may consist of any materialsuitable for employment in microphones for telephonic transmission-forinstance, powdered carbon,pulverized or black platinum, &c.

v The core B is included in a local circuit comprising the wire Z, theprimary inductioncoil P, the battery F, wire Z wire Z, armature E, andconductor 1;.

The core B is included in a local circuit comprising the wire 6', theprimary inductioncoil P, battery F, wire l wire Z, armature E, andconductor 1).

It is to be understood that the magnet-coils A A, which are connected bythe wire Z, are so wound and related to the transmitting-circuit L thatcurrent flowing in the latter serves to oppositely polarize the innerends of the cores B B, which are opposed to the armature E, and that thesecondary induction-coils H H, which are included in thereceiving-circuit L, are respectively in operative relation with theprimary coils P and P.

The device above described operates as follows: A current impulse in thetransmittingline L, tending to make the inner end of core B the northpole, will repel the free end of the armature E, (supposing that saidend is of the same polarity;) but at the same time said armature will beattracted by the inner end of the core B, which the same current impulsehas made the south pole. Every repulsion of the armature E from theinner end of the core B will lessen the normal conductivity of themicrophonic conductor t and diminish the current-flow in the primarycoil P, and therefore induce a current in the secondary coil I-I.Likewise every attraction of the free end of the armature E toward theinner end of the core B will increase the normal conductivity of themicrophonic conductor 7) and increase the current-flow in the primarycoil P and induce a current of opposite direction in the secondary coilH. Therefore as the batteries F F are connected in opposition to eachother and the secondary coils H H are connected in series with eachother the impulses induced simultaneously in said secondary coilsreinforce each other. Therefore it is to be understood that with properproportions of coils, voltage, &c., an impulse of given intensity in thetransmitting-circuit L may be utilized to occasion an impulse of greaterintensity in the circuit L, so that no matter how feeblethe incomingimpulse upon the line L may be the outgoing impulse upon the line Lshall have sufficient intensity to actuate the receiving instrumentsconnected at the opposite end of that line.

I do not desire to limit myself to the precise details of constructionand arrangement herein described, as it is obvious that variousmodifications may be made therein without departing from the essentialfeatures of my invention.

I claim 1. In a telephonic relay, the combination with electromagneticcoils included in a transmitting-line circuit and provided with opposedcores; of a polarized armature interposed between the proximate ends ofsaid cores; microphonic material electrically connecting said armatureto said cores; and local circuits including the primary of aninduction-coil and a sou rce of current connected to said cores andarmature, the secondary of said induction-coil being included in areceiving-line circuit, substantially as set forth.

2. In a telephonic relay, the combination with two electromagnetic coilsincluded in a transmitting-line circuit and provided with opposed cores;of a polarized armature interposed between the proximate ends of saidcores; microphonic material electrically connecting said armature tosaid cores; and local circuits including two sets of batteries and twoprimary induction-coils, in respective electrical connection with saidcores and said armature; the secondaries of said inductioncoils beingincluded in a receiving-line cir: cuit, substantially as set forth.

3. In a telephonic relay, the combination with two electromagnetic coilsadapted to be connected in a transmitting-line circuit and provided withopposed cores; of a polarized armature interposed between the proximateends of said cores; microphonic material on opposite sides of saidarmature; local circuits containing a source of current whose terminalsare respectively connected with said armature and said microphonicmaterial; and, a primary induction-coil in each of said local circuits,provided with a secondary coil adapted to be connected in areceiving-line circuit, substantially as set forth.

4. In a telephonic relay, the combination with two sets of coilsincluded in a transmitting-circuit and each provided with an adjustablecore; of a polarized armature interposed between said cores; microphonicmaterial electrically connecting said cores with the respectivelyopposite sides of said armature; and means to adjust said cores towardand away from said armature, substantially as set forth.

In testimony whereof I sign my name, this 7th day of January, A. D.1903, in the presence of two subscribing witnesses.

ISIDOR KITSEE.

Witnesses:

J AMES H. BELL, WVM. F. WALLACE.

